Survey experts have yet to figure out what caused the most significant polling error in 40 years in Trump-Biden race
- Written by W. Joseph Campbell, Professor of Communication Studies, American University School of Communication
Biden supporters in Philadelphia celebrate when his win -- with a much smaller margin than predicted by polls -- was projected by news outlets on Nov. 7, 2020. Chris McGrath/Getty ImagesMore than six months after the astonishing polling embarrassment in the 2020 U.S. elections, survey experts examining what went wrong are uncertain about what led...


